The properties of an aqueous Bi4Ti3O12 suspension stabilized by an acrylic acid/acrytic ester copolymer have been investigated. The adsorption of a copolymer on Bi4Ti3O12 surface resulted in a dramatic increase in the absolute zeta potential at pH 3-11. Coincidentally, the rheological property of the suspension was significantly improved. The adsorption quantity increased with increasing copolymer concentration at first, then decreased as the copolymer concentration was beyond 1.5 wt%. The viscosity varied in a complicated manner with copolymer concentration, due to the variations in the adsorption quantity and adsorption configuration of the copolymer molecules on Bi4Ti3O12 particle surface. High-quality tapes were prepared through tape casting.